# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html


# useful for handling different item types with a single interface
from itemadapter import ItemAdapter


# class LianjiaPipeline:
#     def process_item(self, item, spider):
#         return item

import csv
class LianjiaPipeline:

    def open_spider(self, spider):
        self.fp = open("tmp.csv", 'w')
        self.writer = csv.writer(self.fp)
        self.writer.writerow(['title', ])

    def close_spider(self, spider):
        self.writer.close()
        self.fp.close()


    def process_item(self, item, spider):
        line = [item['title'],]
        self.writer.writerow(line)
        return item

